Search for cities, countries, lakes and rivers
Merrimack River
Merrimack River Current Water Temperature and Forecast
On this page, you will find comprehensive information about the water temperature in Merrimack River, including current readings, historical data and trends, monthly averages, as well as weather forecasts and upcoming temperature predictions. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Current Water Temperature in Merrimack River
33°F
TODAY
33°F
YESTERDAY
33°F
A WEEK AGO
As of today, the minimum water temperature in the Merrimack River ranges less than 41°F (5°C). Such water is extremely cold and not recommended for swimming without proper preparation. In these conditions, the risk of hypothermia is very high, and prolonged exposure to the water can be hazardous to your health. If you decide to swim, it is important to have the appropriate gear, such as a wetsuit. Typically, only experienced swimmers or those who practice winter swimming venture into such waters.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Analysis, Historical Data, and Forecast of Water Temperature
Water Temperature Chart for Merrimack River Over the Last 30 Days
Today the water temperature in Merrimack River is lower than the same day in previous years. The water temperature range here in February is from 32°F to 48°F. The water temperature has decreased over the past 7 days but has increased over the past month.
The forecasted water temperature values for Merrimack River are presented in the table below.
The actual water temperature values near the shore may differ by a few degrees from the stated values. For the development of the forecast, we use our own mathematical model that takes into account the current water temperature changes, historical data, and key weather trends, including wind strength and direction, and air temperature in each specific region.
Daily Water Temperature Chart
| Date | Current | Average | Forecast |
|---|---|---|---|
| Feb 16 | 33°F | 40°F | |
| Feb 17 | 33°F | 40°F | |
| Feb 18 | 33°F | 40°F | |
| Feb 19 | 32°F | 40°F | |
| Feb 20 | 32°F | 40°F | |
| Feb 21 | 33°F | 40°F | |
| Feb 22 | 33°F | 40°F | |
| Feb 23 | 33°F | 40°F | |
| Feb 24 | 40°F | 33°F | |
| Feb 25 | 40°F | 33°F | |
| Feb 26 | 40°F | 34°F | |
| Feb 27 | 40°F | 34°F | |
| Feb 28 | 40°F | 35°F | |
| Mar 1 | 44°F | 35°F | |
| Mar 2 | 44°F | 36°F | |
| Mar 3 | 44°F | 36°F |
Water Temperature Ranges in Merrimack River by Month
January
| Minimum | Average | Maximum |
|---|---|---|
| 32°F | 40°F | 48°F |
February
| Minimum | Average | Maximum |
|---|---|---|
| 32°F | 40°F | 48°F |
March
| Minimum | Average | Maximum |
|---|---|---|
| 37°F | 44°F | 52°F |
April
| Minimum | Average | Maximum |
|---|---|---|
| 41°F | 50°F | 61°F |
May
| Minimum | Average | Maximum |
|---|---|---|
| 46°F | 56°F | 70°F |
June
| Minimum | Average | Maximum |
|---|---|---|
| 57°F | 65°F | 72°F |
July
| Minimum | Average | Maximum |
|---|---|---|
| 63°F | 68°F | 75°F |
August
| Minimum | Average | Maximum |
|---|---|---|
| 63°F | 71°F | 73°F |
September
| Minimum | Average | Maximum |
|---|---|---|
| 52°F | 64°F | 66°F |
October
| Minimum | Average | Maximum |
|---|---|---|
| 46°F | 56°F | 61°F |
November
| Minimum | Average | Maximum |
|---|---|---|
| 37°F | 47°F | 61°F |
December
| Minimum | Average | Maximum |
|---|---|---|
| 37°F | 40°F | 46°F |
Monthly Water Temperature Histogram for Merrimack River
Water Temperature in Cities and Towns on Merrimack River
Merrimack River Weather
FEBRUARY 23
12°F / 36°F
light drizzlerain: 6% | wind: 11 mph
FEBRUARY 24
12°F / 34°F
light drizzlerain: 7% | wind: 5 mph
FEBRUARY 25
32°F / 41°F
light drizzlerain: 15% | wind: 10 mph
FEBRUARY 26
34°F / 43°F
fograin: 16% | wind: 12 mph
FEBRUARY 27
28°F / 36°F
moderate snow fallrain: 31% | wind: 11 mph
Water Temperature in Merrimack River: General Trends and Swimming Opportunities
Source Pemigewasset River-Winnipesaukee River juncture
• location: Franklin, Merrimack County, New Hampshire
Mouth Gulf of Maine
• location Newburyport, Essex County, Massachusetts
Length 117 mi (188 km)
The Merrimack River, which flows through New Hampshire and Massachusetts, is one of the largest rivers in the northeastern United States. The water temperature in the Merrimack River varies throughout the year, with cooler temperatures in the spring and fall, often ranging from 40°F to 55°F (4°C to 13°C). In the summer months, the water warms up to more comfortable temperatures, typically ranging between 60°F and 75°F (15°C to 24°C), making it more suitable for swimming.
Swimming in the Merrimack River is possible, particularly in areas with slower-moving water or designated recreational zones. Some parts of the river, especially around cities like Lowell and Lawrence, offer public access points where people can swim or relax by the water. However, caution is recommended, as the river's current can be strong in certain sections, and water quality can fluctuate, especially after heavy rainfall. While swimming isn't the most common activity in the Merrimack, it remains an option for those looking to cool off during the summer months. The river is also popular for boating, fishing, and kayaking, attracting a wide range of water enthusiasts.
Geographical Location of Merrimack River
Nearby Rivers
Frequently Asked Questions About Merrimack River and its Water Temperatures
What is the current water temperature in Merrimack River?
The water temperature today in Merrimack River ranges from 32°F (0.0°C) to 57°F (13.8°C).
What is the water temperature in Merrimack River during the summer months?
The average water temperature in Merrimack River during the summer months is typically between 65°F to 71°F (19°C to 21°C), and it can reach up to 75°F (24°C) at its warmest. However, in some years, the temperature may exceed this range.
What is the water temperature in Merrimack River in May?
The average water temperature in Merrimack River in May ranges from 46°F to 70°F (8°C to 21°C).
What is the water temperature in Merrimack River in September?
The average water temperature in Merrimack River in September is typically between 52°F to 66°F (11°C to 19°C).
Where does Merrimack River flow?
Merrimack River flows through United States (New Hampshire, Massachusetts).
Is it possible to swim in the Merrimack River?
Yes, it is possible to swim in the Merrimack River. However, safety and current conditions should always be checked prior to swimming due to occasional pollution issues.
What major cities are located on Merrimack River?
Cities along the course of Merrimack River include Concord (New Hampshire), Haverhill (Massachusetts), Lawrence (Massachusetts), Lowell (Massachusetts), Manchester (New Hampshire), Nashua (New Hampshire).